AD 98-15-02 Airworthiness Directives; Rolls-Royce Limited, Aero Division- Bristol, S.N.E.C.M.A, Olympus 593 Series Turbojet Engines

Makes named: concorde. Read the applicability below — it usually turns on serial or part numbers too.

Rolls-Royce Limited (R-R), Aero Division-Bristol, S.N.E.C.M.A. Olympus 593 Mk. 610-14-28 turbojet engines, installed on but not limited to British Aerospace/Aerospatiale Concorde series aircraft. Note 1: This airworthiness directive (AD) applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated, unless accomplished previously. To prevent rebroached stage 6 high pressure compressor (HPC) disk failure, which could result in an uncontained engine failure and damage to the aircraft, accomplish the following: (a) Accomplish the following in accordance with R-R Service Bulletin (SB) No. OL.593-72-9016-416, Revision 1, dated December 5, 1997: (1) Remove from service rebroached HPC stage 6 disks (B509174 to B509181) listed in Table 1 and 5 of the SB prior to exceeding the earliest of the following: (i) 1,100 cycles in service (CIS) since rebroaching, or (ii) 2,700 cycles since new (CSN) prior to January 1, 2000, or (iii) 2,500 CSN after December 31, 1999. (2) Inspect the HPC stage 6 disks listed in Table 2 and 6 of the SB within the CIS intervals since rebroach as defined in these Tables. Disks with cracks in any blade root slot must be removed from service. Perform the inspection in accordance with R-R SB No. OL.593-72-8951-364, Revision 5, dated August 31, 1995. (3) Remove from service HPC stage 6 disks listed in Table 2 and 6 of the SB prior to exceeding the maximum post-rebroach cyclic life limits as defined in these Tables, or 2,500 CSN after December 31, 1999, whichever occurs first. (b) An alternative method of compliance or adjustment of the compliance time that [[Page 37765]] provides an acceptable level of safety may be used if approved by the Manager, Engine Certification Office. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Engine Certification Office. Note 2: Information concerning the existence of approved alternative methods of compliance with this airworthiness directive, if any, may be obtained from the Engine Certification Office. (c) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the aircraft to a location where the requirements of this AD can be accomplished. (d) The actions required by this AD shall be performed in accordance with the following R-R SB: ---------------------------------------------------------------------------------------------------------------- Document Number Pages Revision Date ---------------------------------------------------------------------------------------------------------------- OL.593-72-9016-416......................... 1-8 1 December 5, 1997. Total pages: 8 OL.593-72-8951-364......................... 1-9 5 August 31, 1995. Total pages: 9 ---------------------------------------------------------------------------------------------------------------- This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Rolls-Royce, PO Box 3, Filton, Bristol BS12 7QE, England; telephone 01-17-979-1234, fax 01-17-979- 7575. Copies may be inspected at the FAA, New England Region, Office of the Regional Counsel, 12 New England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on July 29, 1998. Issued in Burlington, Massachusetts, on July 6, 1998. Jay J. Pardee, Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 98-18648 Filed 7-10-98; 9:32 am] BILLING CODE 4910-13-P